Right now I have 3.90's and that's great for the 306 but going 408 should I put back in my 3.55's? I am a street driver not track, I like to have a first gear and I fry the tires now with the 306. Should I go lower? 3.27? My plans are to eventually go g-force or 6 speed - not sure which. Thanks for your opnions guys. :SNSign:
Alright I know...lots of Questions but heres another ..which gears for 408?
- Thread starter Pokageek
- Start date
BlackVert
15 Year Member
i'm planning on going back to stock 3.27s. it'll be nice to have a speedo that is actually correct. it'll also be nice to turn 2000 rpm at 70mph
OT: what heads, cam, and intake are you going with? decided yet?
OT: what heads, cam, and intake are you going with? decided yet?
diablostang
New Member
I think 3.55's might be my speed. I dont know if the 408 is quieter or not than the 306 at that drone speed but the 50 series will help a lot.
Cam wll be ed crowley. Intake - my engine builder will decide. I am not into revving the car way out though..I can at least say that. I mean, like you I want the low end TQ and nice power to 5-5500. I rarely go 6k.
Heads...this is a tough one for me. One guy is running 10's with the same trick flows I have unported. Yes they are on my 306 but the chart says they are for 351's as well. I am doing more research and may have them ported a bit depending on cost...but here is an article with a head that flows a little less than mine and some dyno results..chevy but simlar scenario 383ci:
" The one goal that most engine builders share is making the most power for the least money. Since cylinder heads are typically the bottleneck of an induction system, that's where the smart money usually gets spent. This often leads the determined enthusiast to shop through multiple aftermarket cylinder head catalogs until a head that flows big-time air is found for a reasonable price. In 1996, Chevy introduced its Vortec cylinder head on the L31 truck engine and it didn't take long for enthusiasts to bolt them on their engines and find out how good they really are. The cast-iron Vortec heads offer a 170cc LT1-derived port, making them great performance pieces for street engines when tons of torque is key. As the displacement of the engine increases, the torque numbers go through the roof and the horsepower figures follow.
CHP recently bolted a pair of Vortec heads on a 383ci (see "Twister, Part III" on page 96) and made 486 lb-ft of torque at 4,600 rpm and 449 hp at 5,300 rpm. These power levels were achieved using a stock iron Vortec cylinder head featuring 64cc combustion chambers and 1.94-/1.50-inch intake/exhaust valves."
Considering I have a larger engine and a little better flow with my heads, I would be in the same range even unported.
Cam wll be ed crowley. Intake - my engine builder will decide. I am not into revving the car way out though..I can at least say that. I mean, like you I want the low end TQ and nice power to 5-5500. I rarely go 6k.
Heads...this is a tough one for me. One guy is running 10's with the same trick flows I have unported. Yes they are on my 306 but the chart says they are for 351's as well. I am doing more research and may have them ported a bit depending on cost...but here is an article with a head that flows a little less than mine and some dyno results..chevy but simlar scenario 383ci:
" The one goal that most engine builders share is making the most power for the least money. Since cylinder heads are typically the bottleneck of an induction system, that's where the smart money usually gets spent. This often leads the determined enthusiast to shop through multiple aftermarket cylinder head catalogs until a head that flows big-time air is found for a reasonable price. In 1996, Chevy introduced its Vortec cylinder head on the L31 truck engine and it didn't take long for enthusiasts to bolt them on their engines and find out how good they really are. The cast-iron Vortec heads offer a 170cc LT1-derived port, making them great performance pieces for street engines when tons of torque is key. As the displacement of the engine increases, the torque numbers go through the roof and the horsepower figures follow.
CHP recently bolted a pair of Vortec heads on a 383ci (see "Twister, Part III" on page 96) and made 486 lb-ft of torque at 4,600 rpm and 449 hp at 5,300 rpm. These power levels were achieved using a stock iron Vortec cylinder head featuring 64cc combustion chambers and 1.94-/1.50-inch intake/exhaust valves."
Considering I have a larger engine and a little better flow with my heads, I would be in the same range even unported.
Well ... Once again ... I'm so old 
I was around when REAL Big Block Fords were the norm
I've owned several of them ... and can say from experience
That rule of thumb about ...........
running a lower (numerical) gear with a big block is true
The simple reason is you got plenty of torque
and
Unlike a small block ... your need for steeper gears isn't as great
Now even though a Stroked Windsor usually doesn't put up
torque values as great as those old big blocks ..........
The difference is not so much as it makes that old rule of thumb void
All you guys of today just kill me When you talk about gears
Back when I was most of you guys age ............
The last forward gear we could use was a 1 to 1 ratio
Ever heard of ........... "Four on the Floor"
Over drives .............. "We don't need no Stinkin Overdrive"
When I went out on the weekend to raise a little rukus
I was packin a set of 457's in a 9' rear end
Then again ... my wrinkle wall slicks were 28" tall
btw ... I wouldn't wanna give up my OD these days
Grady
I was around when REAL Big Block Fords were the norm
I've owned several of them ... and can say from experience
That rule of thumb about ...........
running a lower (numerical) gear with a big block is true
The simple reason is you got plenty of torque
and
Unlike a small block ... your need for steeper gears isn't as great
Now even though a Stroked Windsor usually doesn't put up
torque values as great as those old big blocks ..........
The difference is not so much as it makes that old rule of thumb void
All you guys of today just kill me
When you talk about gearsBack when I was most of you guys age ............
The last forward gear we could use was a 1 to 1 ratio
Ever heard of ........... "Four on the Floor"
Over drives .............. "We don't need no Stinkin Overdrive"
When I went out on the weekend to raise a little rukus
I was packin a set of 457's in a 9' rear end
Then again ... my wrinkle wall slicks were 28" tall
btw ... I wouldn't wanna give up my OD these days
Grady
BlackVert
15 Year Member
dude, you should read this ... 3.27's might even be too steep
http://www.corral.net/forums/showthread.php?t=879369
if that is any indication, then we are in for alot of fun ...
http://www.corral.net/forums/showthread.php?t=879369
if that is any indication, then we are in for alot of fun ...
trav_19
New Member
....i thought you totaled out your car?? what ever happened i never heard anymore about it or seen any pics??
OMG.
Then again on the heads, I could have this happen...here I go with stupid chevy quotes again but still...
"Dyno results, a little dissapointed.
--------------------------------------------------------------------------------
Dyno results, I am a little dissapointed.
Here is the engine:
383 stroker.
Eagle forged 4340 crank, Weisco flat top pistons, Eagle forged rods, Internally balanced.
WP Torquer Heads (76cc chamber, 170cc runners, 2.02/1.60 valves)
GM LT4 Hotcam (.525/.525", 112 LSA, 218/224 duration)
GM roller rockers, 1.6's
March underdrive pulley set
BBK 52mm tb
SVO 30lb injectors
MSD coil
TPiS Miniram intake
MSD distributor
Edelbrock shorty headers
No cat
Flowmaster 3" exhaust
PCMFORLESS Tune
Ask me if yo udon't see something significant...
Dyno results:
280 rwhp
400.7 rwtq
That horsepower number seems real low. I knew my head and cam where small for the enigine, I din't hink they would be that small?? What do you guys think"
The age old Q of ... "What rpm will I turn on the highway"?
is easily determined by any of those math formulas
and
The abundance or lack of torque your motor produces .......
has nothing to do with that decision
You need to factor in your trans type and it's ratios here
But if I was gonna give you a ball park answer
I'd tell you ... speaking stick trans ......... 327's or 355's
If you go auto trans ... I can't help you there.
Grady
BlackVert
15 Year Member
what i see is a 52mm t/b, and the worst numbers one could hope for from a 383.
that won't happen to you.
if, after you get it together, you are not happy with the heads, then you can swap them out.
i'm now thinking i should have gone with 225s, a victor efi intake, and a XE282 cam. but i'm not changing anything until after the dyno tells its story.
it is getting put together now. with any luck, i will get it back by the end of the month
that won't happen to you.
if, after you get it together, you are not happy with the heads, then you can swap them out.
i'm now thinking i should have gone with 225s, a victor efi intake, and a XE282 cam. but i'm not changing anything until after the dyno tells its story.
it is getting put together now. with any luck, i will get it back by the end of the month
http://store.summitracing.com/partd...908331+4294840125+4294866476+115&autoview=sku
Gotta cut somehwere but I could go with these... I could also move the battery to trunk. I have already removed A/C and that is good for 40# anyway!
Gotta cut somehwere but I could go with these... I could also move the battery to trunk. I have already removed A/C and that is good for 40# anyway!
BlackVert
15 Year Member
i have looked at those ... note that the price is individual. also note that they are bare. after valves, springs, and retainers and all that stuff, they aren't quite as inexpensive as they might seem. which tfs heads do you have again?
gcomfx.com
Founding Member
Well ... Once again ... I'm so old
I was around when REAL Big Block Fords were the norm
I've owned several of them ... and can say from experience
That rule of thumb about ...........
running a lower (numerical) gear with a big block is true
The simple reason is you got plenty of torque
and
Unlike a small block ... your need for steeper gears isn't as great
Now even though a Stroked Windsor usually doesn't put up
torque values as great as those old big blocks ..........
The difference is not so much as it makes that old rule of thumb void
All you guys of today just kill me
Back when I was most of you guys age ............
The last forward gear we could use was a 1 to 1 ratio
Ever heard of ........... "Four on the Floor"
Over drives .............. "We don't need no Stinkin Overdrive"
When I went out on the weekend to raise a little rukus
I was packin a set of 457's in a 9' rear end
Then again ... my wrinkle wall slicks were 28" tall
btw ... I wouldn't wanna give up my OD these days
Grady
Given the prices of gas back then, and the posted speed limits.... are you really that surprised?
Given the prices of gas back then, and the posted speed limits.... are you really that surprised?
You wanna here somethin that will make you feel sick
My first SERIOUS car that would make any decent power
64 Falcon ... all the hot rod parts available ... at least back then ...
were in place on that little car.
It didn't even get 10 mpg during the week going to school and back
Heck ... When I made a pass down the 1320 ..........
You could noticeably see the gas gauge had moved ... Really
Back Then ............. Who cared .............
Lowest Octane Grade was less than .25 per gallon
Then again ... I was makin $2.00 bux an hour
and
Others thought .......... I was rakin it in
Times do change!
Grady
BlackVert
15 Year Member
sorry ... i thought they were the ones i was looking at before ... my bad.
i actually have a used set like those sitting in my basement ... they were recently rebuilt, are ported, o-ringed, and have springs good to .600 lift ... 3 passes on them since the rebuild. the guy i bought them from said they were on his turbo car that goes 8s. i was going to use them for my 331 buildup. we both know what happened to that ...
call me if you are interested in them ... 301-572-3800 ext 2241
Thanks man. My engine builder is insisting that my trick flows will work very well. I will have to discuss this with him and get back to you shortly. I am not second guessing him but I would like to understand how 170cc heads are going to get me to 400rwhp? He also looked at that cheby example and said that dude's combo was all unmatched.
My engine builder is insisting that my trick flows will work very well. I will have to discuss this with him and get back to you shortly. I am not second guessing him but I would like to understand how 170cc heads are going to get me to 400rwhp? He also looked at that cheby example and said that dude's combo was all unmatched.
